Resistor Circuits

Online calculators for resistor networks, voltage dividers and circuit analysis

Fundamentals and Parallel Circuits

Ohm's Law

Basic calculation of voltage, current and resistance

Two Parallel Resistors

Total resistance of two resistors connected in parallel

Multiple Parallel Resistors

Total resistance of any number of resistors connected in parallel

Voltage Dividers

Unloaded Voltage Divider

Output voltage of an unloaded voltage divider

Loaded Voltage Divider

Output voltage of a loaded voltage divider considering load resistance

Pi Attenuator

Resistance values for Pi attenuators with given attenuation

T Attenuator

Resistance values for T attenuators with given attenuation

Measurement Technology

Series Resistor (Voltmeter)

Series resistor for extending the measuring range of voltmeters

Shunt Resistor (Ammeter)

Parallel resistor for extending the measuring range of ammeters (shunt)

About the Resistor Circuit Calculators

Circuit Analysis

This calculator collection covers all important aspects of resistor circuits. From basic parallel circuits through voltage dividers to complex network analyses and high-frequency attenuators.

Core Areas:
  • Basic circuits (parallel/series)
  • Voltage dividers and current dividers
  • Measurement technology applications
  • High-frequency attenuators
Practical Applications

The calculators are specifically designed for practical applications. From simple resistance calculations through measurement range extensions to professional RF circuits - all important formulas are precisely implemented.

Application Areas:
  • Electronics development
  • Measurement technology and calibration
  • High-frequency technology
  • Education and studies
For Education and Profession

All calculators contain detailed explanations, practical examples and application notes. Ideal for electrical engineering students, engineers and practitioners who need fast and precise circuit calculations.

Important Resistance Formulas Overview
Basic Laws
U = R × I (Ohm's Law)
P = U × I = I²×R = U²/R
G = 1/R (Conductance)
ρ = R×A/l (Specific resistance)
Circuits
Series: R_total = R₁ + R₂ + ... + Rₙ
Parallel: 1/R_total = 1/R₁ + 1/R₂ + ...
2 parallel: R_total = R₁×R₂/(R₁+R₂)
Voltage divider: U_out/U_in = R₂/(R₁+R₂)
Measurement Technology
Series resistor: R_series = R_i×(n-1)
Shunt: R_shunt = R_i/(n-1)
Attenuation: a = 20×log(U₁/U₂) [dB]
Characteristic impedance: Z₀ = √(R/G)
Related Calculator Categories
Fundamentals
Passive Components
Active Circuits